You run your hand through his hair and kiss his cheeks while he's playing his game. But as you do so, he's awfully quiet, so you ruffle his hair in an attempt to get his attention.

"....." He struggles for words not knowing what to say, he's thinking about how to explain things, specifically the fact that he is not his brother who is your boyfriend. but then he decided to pretend as his brother and kisses your cheek and says…

“you really can’t tell us apart, huh? baby.”